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He is an "immensely aged mestizo [...] who claimed to have sailed to strange ports and talked with undying leaders of the Cthulhu Cult in the mountains of China." Castro was arrested on November 1, 1907 during a New Orleans police raid on a cult ceremony in Louisiana.

Robert M. Price believes that Castro's name is based on that of Adolphe DeCastro–born Adolph Danziger–an author of "unbelievably bad fiction" who hired Lovecraft as a ghostwriter.[1] Joshi and Schultz, however, report that Lovecraft did not become acquainted with DeCastro until late 1927, whereas "The Call of Cthulhu" was completed in 1926.[2]